Yang Chaosan, Zhang Tianqi, Pan Yi, et al. Dual way reference signal-based detection of digital LIA weak signals[J]. 2013,(6):42-45. DOI: 10.13756/j.gtxyj.2013.06.003.
This paper introduces the detection of the weak sinusoidal signals of Lock-in Amplifiers(LIA)by using In-phase Quadrature(IQ)dual-way reference signals.It first uses the atom pairs of the atomic reservoir as the reference signals by sparse decomposition and searches for the optimal atom pair by using the Matching Pursuit(MP)algorithm.Then
it decides the best phase angle from this atom pair and thus synthesizes the optimal atom.From this optimum atom it obtains estimated useful input signals and detects the sine signals in the input signals.Compared with the single way digital LIA
this approach is better in computational efficiency as the computation speed is doubled and inherits the advantages of the former.
关键词
微弱信号检测锁定放大器稀疏分解匹配追踪算法
Keywords
weak signal detectionLIAsparse decompositionMP algorithm